Stevens Pass Weather

12/1/2008 Weather Discussion: A cold front approaching the coast will bring rain to the mountains tonight. High pressure will begin to build tomorrow afternoon for a return to dry weather for the 2nd half of the week. Long-term models show the possibility of the high pressure breaking down late in the week. This should allow the jet stream to dig south and set up the recipe for a NW storm track. The timing is too far out to bank on the details, but there is some hope for some snow through the weekend. Forecast from Monday 4pm to Tuesday 4am Precipitation .25 in. Water 0 in. Snow Temperatures Low 34 High 40 Winds 0-10 SW Forecast for Tuesday 4am to 4pm Precipitation .25 in. Water 0 in. Snow Temperatures Low 32 High 38 Winds 5-10 W TRENDS AND TIMING Precipitation: Rain should begin this afternoon and increase after 4pm. Rain, with a little snow mixed in, should continue through most of tomorrow. The precipitation should be over soon after sundown tomorrow. It is possible to get a short period of snow toward the tail end of this system tomorrow afternoon or evening. Freezing levels: The current 8000’ freezing levels will slowly drop in the wake of the cold front. Freezing levels will reach 4000’ sometime tomorrow. A cool air mass filtering down from Canada’s Frazer River will drop freezing levels east of the crest tomorrow night and Wednesday. Winds: SW flow will slowly swing westerly by tomorrow. The clock wise swing will continue to eventually settle on a east flow pattern by Thursday.